Sealing or guiding assemblies and methods of making them

Abstract: A sealing or guiding assembly for sealing or guiding the corner of a movable window glass, such as for the window in a motor vehicle door, comprises two lengths of sealing or guiding strip (91A,91B) connected together at a corner (116). The corner is bridged across by a flexible flap (120) which is produced by an in-situ moulding operation. The moulding operation is carried out so that the flap (120) is connected to each sealing strip only over a small area (122). The flap is therefore otherwise spaced from each sealing strip by a gap (124) which, during the moulding operation, is occupied by a plate defining part of the mould cavity. This plate and the gap (124) protect an adjacent flocked area of a lip (102) from damage by the heat of the moulding operation. The flap defines a shallow groove (128) matching a ridge (130) on the sealing strip which engage each other when the two lengths of sealing strip (91A,91B) and the flap (120) are together placed into position on a rigid support at the corner, so that the areas of the flap (120) which overlap each sealing strip (91A,91B) to move into contact with the sealing strip and are held in such contact by the rigid support.

Description: The invention relates to sealing or guiding assemblies and methods of making them. Embodiments of the invention, to be described in more detail below, are window sealing and guiding strip assemblies for use in motor vehicle body construction and, in particular, for use in window frames forming the upper part of vehicle doors, the sealing or guiding strip assembly being attached to the window frame and supporting the edge of a window pane which can be raised from and lowered into the lower part of the door. However, the invention is not restricted to such applications. According to the invention, there is provided a sealing or guiding strip assembly, comprising strip means and a portion of flexible material overlapping an area of the strip means and attached to the strip means over a restricted part, only, of the said area, the said portion being formed in situ on the strip means by a heat-moulding operation, the portion having first and second possible positions relative to the strip means, the first position being a position operative during the moulding operation and being a position in which the portion is spaced from the strip means over the majority of the said area so that the material of the strip means is protected from damage by the heat of the moulding operation, and the second position being a position adopted after the completion of the moulding operation and being a position in which the portion is immediately adjacent to the strip means over the said area. According to the invention, there is further provided a sealing or guiding strip assembly for sealing or guiding a sharp corner of a window pane, comprising two lengths of strip secured together to define the sharp corner and together defining a guide channel for receiving the window pane, and a generally planar portion of flexible material produced in situ by a heat-moulding operation so as to bridge across the sharp corner and to overlap a respective area of each strip adjacent the guide channel, the said portion being separate from each strip over a major part of the said area and being attached to each strip over an attachment region forming a minor part of the said area, the said portion having a first position relative to the strips in which position it is formed by the moulding operation and so that it is spaced from each strip over the major part of each said area whereby the material of each strip is substantially unaffected by the heat of the moulding operation, and a second position relative to each strip in which it is in contact with each strip over the major part of each said area. According to the invention, there is further provided a method of heat-moulding a portion of flexible material onto a length of sealing or guiding strip which has a region susceptible to damage by heat, comprising the steps of defining a mould cavity for the moulding operation so that the cavity is spaced from the strip over a major part of a predetermined area of the strip immediately adjacent the said region and is connected with the strip over a minor part of the said area which is spaced from the said region, whereby the said portion of flexible material is mouldingly attached to the strip over the minor part of the area but is spaced from the major part of the area so that the said region is protected from damage by the heat of the moulding operation, the said portion of flexible material being thereafter movable into a position in which it is in contact with the strip over the major part of the said area. A window sealing and guiding strip assembly embodying the invention, and a method according to the invention of making it, will now be described, by way of example only, with reference to the accompanying diagrammatic drawings in which: Figure 1 is a side view of a motor vehicle body; Figure 2 is a diagrammatic perspective view of part of the window frame shown circle at II in Figure 1 but omitting the window sealing and guiding strip assembly; Figure 3 is a perspective view of a corner support for the sealing and guiding strip assembly; Figure 4 is a perspective view of the frame of Figure 2 but also showing the corner support of Figure 3 in position thereon; Figure 5 is a perspective sectional view of a sealing and guiding strip used in the assembly; Figure 6 is a perspective view of the assembly; Figure 7 is a scrap sectional view showing the assembly of Figure 6 in position on the corner support of Figure 3; Figure 8 is a view corresponding to Figure 7 but showing the assembly immediately after a moulding operation; Figure 9 corresponds to Figure 6 and shows the assembly of Figure 6 immediately after the moulding operation; and Figure 10 is a view corresponding to Figure 7 but showing a modification. Figure 1 shows the side of a motor vehicle body having a door 5 with a lower part 6 carrying a window frame indicated diagrammatically at 8 for a window opening 10. In the usual way, a window glass for the opening 10 can be raised from and lowered into the lower part 6 of the door. The frame 8 carries the sealing and guiding strip (not visible in Figure 1) which will be described in more detail below. The frame 8 comprises a part 8A along the sloping front of the door which is alongside the so-called "A" pillar of the vehicle body, a generally vertical part 8B alongside the so-called "B" pillar 12 of the vehicle body, and a part 8C running along the top of the door. Where the "B" pillar 12 meets the roof 14 of the vehicle, a sharp angle (substantially 90°) is formed, at 16. In a manner to be explained below, the sealing and guiding strip assembly to be described combines with the frame 8 to form a corresponding sharp angle 18. The frame 8 carried by the door is (in this example) made of metal, such as extruded aluminium. Figure 2 shows part of the frame 8 at the corner 18 and is an enlarged view of the region II of Figure 1. The sealing and guiding strip assembly is omitted from Figure 2. As indicated in Figure 2, the frame is made of a hollow aluminium extrusion 20 which has a curved portion 22 at the corner 18. As shown in Figure 1, therefore, this curved portion 22 bridges across the sharp corner. Facing outwardly of the vehicle, the aluminium extrusion 20 defines a channel 24 and an outwardly protruding flange 26. However, it will be noted that the flange 26 is interrupted (that is, omitted) over the curved region 22 of the extrusion, so as to form a gap 28. Figure 3 shows a corner support 80 which is separately constructed from metal such as aluminium and, in a manner to be explained, is shaped and sized to fit the gap 28 (Fig. 2). The corner support 80 is of simple construction comprising a platform 82 which, on one side, carries a flange 84 of the same general thickness as the flange 26 on the aluminium extrusion 20 (see Fig. 2) and, on its other side, carries a thicker shoulder 86. The corner support 80 is shaped to provide an outside edge 88 which matches the angle of the corner 18. Its opposite edge 90 is curved to match the outside radius of the curved portion 22 (see Fig. 2) of the aluminium extrusion 20. Figure 4 shows the corner piece 80 mounted in position on the aluminium extrusion 20. The shoulder 86 (Fig. 3) of the corner piece 80 is slotted into the channel 24 over the curved region 28 of the aluminium extrusion 20 (Fig. 2), and is a tight fit in the channel. The flange 84 of the corner piece 80 is thus aligned with the flange 26 of the aluminium extrusion; together, they form a continuous flange having a sharp angle (substantially 90°) matching the angle shown at 16 in Figure 1. In the manner to be explained, this continuous flange, made up of the separate flanges 26 and 82, supports the sealing strip. Figure 5 shows one form which the sealing strip 91 can take. As indicated, it comprises extruded material 92, such as plastics or rubber material, which defines a channel 93 and incorporates a channel-shaped metal carrier 94. The carrier 94 may take any suitable form. It may be in the form of a continuous unapertured metal channel. Instead, it may be apertured to increase its flexibility. In another form, it comprises a series of side-by-side generally U-shaped metal elements defining the channel and either entirely disconnected from each other or connected such as by short integral flexible connecting links. In a further form, the carrier comprises looped wire. Other possible forms of carrier may be used, though. As shown, the carrier 94 has an integral extension 96 which extends at right angles to the channel 93. The carrier extension 96 reinforces a wall 98 of a window glass receiving channel 100. The wall 98 is integral with a re-entrant lip 102, and the opposite wall of the glass-receiving channel 100 is formed by a lip 104. A further lip 106 is mounted on the base of the channel 100. In use, the sealing strip 91 is mounted in position on the flange 26 or the flange 84 (Figures 3 and 4) by positioning the strip so that the flange engages in the channel 93. The strip 91 firmly grips the flange, the gripping force being assisted by the resilience of the metal carrier 94 and also by the provision of integral flexible lips 108 which extend inwardly of the channel 93. The lips 108 may be extruded so as to be of softer material than the remainder of the extruded material 90, to increase their frictional grip. In this way, the strip 91 presents the glass-receiving channel 100 in the plane of the window opening so that the sliding window glass enters the channel 100. The outwardly facing surfaces of the lips 102 and 106 are coated with flock where they meet the window glass. As shown in Figure 5, the sealing strip 91 includes further lips 110 and 112 on the outside of the window frame, that is, on the outside edge of the door. These lips 110 and 112 engage the frame of the door opening when the door is closed, to provide a seal around the edge of the door. The sealing strip 91 may also incorporate a separate metal reinforcing strip 114. At the corner of the window frame formed by the corner support 80 (Figures 3 and 4), two lengths of the sealing strip 91 are joined together to match the corner, as indicated in Figure 6. More specifically, two lengths of sealing strip 91A and 91B are mitre-cut and then joined together along the line 116 (Fig. 6). In addition, and as will be described in more detail below, a moulding operation is carried out to form a flexible corner piece 120 (Figure 6) from rubber or other suitable material, the corner piece 120 being attached to the underside of the wall 98 of the sealing strips 91A and 91B and having a shape which generally matches, and thus in use covers, the platform 82 of the corner support 80 (see Figs. 3 and 4). Figure 7 shows the sealing strip 91A and the corner piece 120 in position on the corner support 80, and shows how the channel 93 of the sealing strip 91A embraces the flange 84 of the corner support 80. Figure 7 also shows how the corner piece 120 lies on the platform 82 of the corner support 80. The corner piece 120 is formed with a curved-over lip 122 which contacts the surface of the aluminium extrusion 20 (Figure 4). As indicated above, the corner piece 20 is produced by a moulding operation. The two lengths of strip 91A,91B joining at the corner (Figure 6) are placed in a mould (not shown) which has a cavity matching the shape of the corner piece 120 and into which material is forced and heated to mould to the corner piece. Figures 8 and 9 show the corner piece 120 after it has been produced by this moulding operation. These Figures show that the corner piece 120 is produced so that it is attached to the sealing strip 91A only over a region 122, adjacent to the mouth of the channel 93. It is spaced from the remainder of the wall 98 of the glass-receiving channel 100 to form a gap 124 having a mouth of width "X". This form of construction enables the corner piece 120 to be produced by a moulding operation which avoids the application of excessive heat to the sealing strip and, in particular, to the flock on the surface of the lip 102. The mould cavity in which the corner piece 120 is moulded is formed by an upper mould plate (not shown) which is positioned where the gap 124 is shown in Figure 8. The lower mould plate (also not shown) is positioned below the upper mould plate, and together the two mould plates are shaped to define the cavity matching the required shape of the corner piece 120. During the moulding operation, heat is applied to form the moulding material in the mould cavity into the desired shape for the corner piece, but the upper mould plate protects the flock on the lip 102 against being damaged by this heat. This process therefore enables the corner piece to be moulded onto already-flocked lengths of the sealing strip. In the absence of the arrangement shown in Figs. 8 and 9, with the corner piece 120 being formed as a flap attached to the sealing strip only over the minor portion 122 but otherwise spaced from the strip by the upper mould plate which forms the gap 124, the potentially damaging effect of the heat on the flock would necessitate carrying out the flocking operation after production of the corner piece 120. Such a separate flocking operation would be complicated and expensive and is avoided in the manner described above. The moulding operation produces the corner piece with a shallow groove 128 running along its surface. This matches a ridge 130 on the underside of the wall 98, so that the ridge 130 engages in the groove 128 when the sealing strip and corner piece 120 are fitted into position on the corner support 80 (Figure 7). The corner piece 120 is thus held securely in position and cannot move relative to the sealing strip 91. Advantageously, the corner piece 120 also incorporates an integral flexible region 132. Figure 7 shows how the corner support 80 may be attached to the aluminium extrusion 20 as by welds 134. Figure 10 shows a modification in which the shallow groove 128 in the corner piece 120 is not present, and nor is the matching ridge 130 on the underside of the wall 98. Instead, the corner piece 120 is itself provided with a protruding ridge 140 on its underside which, when the assembly is fitted in position on the corner support 80, engages in a groove 142 in the upper surface of the corner support. In this way, the corner piece 120 is again held securely in position and cannot move relative to the sealing strip 91. The ridge 140 and/or the groove 142 can be dimensioned to take account of manufacturing tolerances.

Claims: A sealing or guiding strip assembly, comprising strip means (91), characterised by a portion of flexible material (120) overlapping an area of the strip means (91) and attached to the strip means (91) over a restricted part (122), only, of the said area, the said portion (120) being formed in situ on the strip means (91) by a heat-moulding operation, the portion (120) having first and second possible positions relative to the strip means (91), the first position being a position operative during the moulding operation and being a position in which the portion (120) is spaced from the strip means (91) over the majority of the said area so that the material of the strip means (91) is protected from damage by the heat of the moulding operation, and the second position being a position adopted after the completion of the moulding operation and being a position in which the portion (120) is immediately adjacent to the strip means over the said area. An assembly according to claim 1, characterised in that the said portion (120) comprises a generally planar flap (120) of material and in which the said restricted part of the said area is adjacent an edge of the flap. An assembly according to claim 2, characterised in that the strip means (91) comprises two lengths of sealing strip (91A,91B) meeting at, and connected to each other at, a sharp corner, the flap (120) bridging between the two lengths (91A,91B) of sealing strip. An assembly according to any preceding claim, characterised in that the said portion (120) of material defines a surface formation (128) spaced from the restricted part (122) of the said area and interlocking with a corresponding surface formation (130) within the said area of the strip means (91) when the portion is in the said second position. An assembly according to any preceding claim, characterised in that the strip means includes means for attaching the arrangement (93) to a mounting surface (80). An assembly according to any one of claims 1 to 3, characterised in that the strip means (91) includes means (93) for attaching the arrangement to a mounting surface (80), and in that the said portion of material defines a surface formation (140) spaced from the restricted part (122) of the said area and interlocking with a corresponding surface formation (142) on the mounting surface (80). An assembly according to claim 5 or 6, characterised in that the said portion lies between the mounting surface (80) and the strip means (91) and is held in the second position by the mounting surface (80). An assembly according to any preceding claim, characterised in that the strip means (91) includes a flocked region (102,106) adjacent the said area. An assembly according to any preceding claim, characterised in that the said portion when in the said first position defines a gap between itself and the major part of the said area, the gap being occupied during the said moulding operation by means defining a part of the mould cavity. A method of heat-moulding a portion of flexible material (120) onto a length of sealing or guiding strip (91) which has a region (102,106) susceptible to damage by heat, characterised by the steps of defining a mould cavity for the moulding operation so that the cavity is spaced from the strip (91) over a major part of a predetermined area of the strip immediately adjacent the said region and is connected with the strip (91) over a minor part (122) of the said area which is spaced from the said region, whereby the said portion of flexible material (120) is mouldingly attached to the strip (91) over the minor part (122) of the area but is spaced from the major part of the area so that the said region is protected from damage by the heat of the moulding operation, the said portion (120) of flexible material being thereafter movable into a position in which it is in contact with the strip (91) over the major part of the said area. A method according to claim 10, characterised in that the said portion (120) of flexible material defines a locking formation (128,140) for lockingly engaging a matching formation (130,142) when the said portion (120) is in the position in which it is in contact with the strip (91).

Inventors: ANDRZEJEWSKI HEINZ, BACKES HEINZ-PETER, ANDRZEJEWSKI, HEINZ, BACKES, HEINZ-PETER
Applicants: DRAFTEX IND LTD, DRAFTEX INDUSTRIES LIMITED
Application year: 1994
Main classification: B60J10
IPC codes: B60J10, B60R13